Typewriting-machine



D. A. CARPENTER.

TYPEWRITING MACHINE.

APPLICATION FILED JUNE 5.1920.

. Patented Aug. 2, 1921.

3 SHEETS-SHEET \NVENTUR D7, HIS ATTURNEY WITNESSES D. A. CARPENTER.

,TYPEWRITING MACHINE. APPLICATION FILED JUNE 5, I920.

Patented Aug. 2, 1921.

s SHEETS-SHEET 2 on A k mm In \NVENTUR AM Hi5 ATTURNEY D. A. CARPENTER.

TYPEWRITING MACHINE.

APPLICATION FILED JUNE 5, 19'20.

Patented Aug. 2, 1921.

3 SHEETSr-SHEET 3- WlTNEEEEE: 4% 2 77 M.

UNITED STATES PATENT orrics.

DANIEL A. CARPENTER, or new YORK, n. Y., ASSIGNOR T0 REMINGTON TYPE- WRITER COMPANY, or ILION, New YORK, A CORPORATION or NEW YORK.

TwEWItI'TING-MACHINE.

Application filed June 5, 1920.

T 0 all to 72 0 mz't may concern Be it known that I, Denim, A. CARPEN- TER, citizen of the United States, and resident of the borough of Bronx, city of New York, in the county of Bronx and State of New York, have invented certain new and useful Improvements in Typewriting-Machines, of which the following is a specification.

This invention relates to improvements in escapements of typewriting machines in which force exerted by the motor spring of the carriage is transmitted to a toothed escapement wheel which it tends constantly to turn in one direction, and to which it imparts intermittent movements depending on the operation of a key actuated dog or pair of dogs with which the teeth of the wheel coact. The object of the invention, generally stated, is to improve the operation and increase the number of good qualities of such escapements. The invention consists of an escapement comprising the mechanism which is hereinafter described and specified in the claims, and the novel features of which pertain mainly to the construction and operation of the stepping or snapping dog, and to the combination with it of a dog rocking device and a shock absorbing device.

In the accompanaying drawings, of which there are three sheets on which like reference numerals designate like parts of different views:

Figure 1 is a rear sectional elevation of an escapement in which features of the invention are embodied, and of a fragment of the framework of a typewriting machine which includes the escapement, the sectional plane being indicated by the line l1, Fig. 2;

Fig. 2, a side elevation of the same, and some other mechanism, and of a fragment, partly in section, of the framework, a cross section of the carriage rack being also shown;

Fig. a sectional plan on the plane Fig. 1, of parts of the mechanism, including the escapement wheel and adjacent devices Fig. 4, a sectional plan on the planes l4, Fig. 1, showing the snapping dog and fragments of the escapement wheel and dogsupporting devices;

Fig. a perspective of the dogs and coacting devices. separated from the rest of the machine;

Specification of Letters Patent.

vriage releasing device,

Patented A11 2, 1921. Serial No. 386,725. i

Fig. 6, a front face view ofa part and of a fragment of another part of the mechanism represented by Fig. 5;

Fig. 7, a. sectional plan on the plane 7-7, Flg. l, of features illustrated in perspective in F ig. 5 and in rear and side elevation in Figs. 1 and 2, respectively;

Fig. 8, a fragmental rear elevation illustrating a modification which includes a shock absorbing stop device;

Fig. 9, a side and sectional elevation of parts of this modification;

Fig. 10, a fragmental and sectional plan of parts of this modification, combined With a slide which forms a dog rocking and can and with tabulator stop-levers which act on and operate the slide;

Fig. 11, a fragmental side and sectional elevation of parts of this escapement and tabulator;

Fig. 12, a fragmental side and sectional elevation of an escapement which includes the snapping dog illustrated in Figs. 1 to 7, inclusive, a holding dog, and a dog rocking device carrying stops, but does not include a slide which forms part of the dog rocking device illustrated in those figures;

Fig. 13, a rear elevation of the holding dog and fragments of the dog rocking device, snapping dog and escapement wheel, of the escapement represented by Fig. 12;

Fig. 14, a plan of the holding dog and dog rocking device which form parts of the last mentioned escapement;

Fig. 15, a side and sectional elevation of parts of an escapement, together with a fragment of framework. which escapement contains modifications of some of the features shown in other views above mentioned; and

Fig. 16, a sectional plan of that part of the mechanism which is shown in Fig. 15 below the line l6-16.

The invention may be applied to typewriting machines of many forms. The particular machine in which it is shown is a Remington deprived of part of its escape- Incnt mechanism. It includes a universal bar which is movable by the type bars toward the back of the machine and which usually is connected to a downwardly extending arm of a dog rocker. In the operation of the machine the lower end of this arm is moved by the action of the universal bar toward the back of the machine. Such a universal bar connected to the dog rocker of an escapement is illustrated and described in Patent No. 1,289,934, granted Dec. 31, 1918, for an invention made by George A. Seib.

In-the above mentioned Remington machine the motor spring of the carriage transmits force to a toothed escapement wheel 1 (Figs. 1 and 2) which it tends constantly to turn in the direction indicated by the curved arrow (Fig. 1). This force acts through the rack bar 2, pinion 3, sleeve 4, ratchet wheel 5 and pawl 6, on the hub 7 of the escapement wheel, the pawl being mounted at the front of the hub on the pin 8 (Fig. 1) which is fixed in and projects from the hub, and being under spring pressure exerted by the spring 9 (Fig. 3) attached to the hub. The rack bar is attached to the carriage, the pinion is fast on the sleeve, and the sleeve and ratchet wheel are parts of one piece of stock. The pawl engages inner faces of the ratchet teeth, which also have outer faces intended to be'engaged by a back spacing pawl (not shown herein). The escapement wheel includes the spider 10 on which are the teeth 11 and which is attached to thehub '7 by the screws 12; The hollow screw plug 13 having the head let extends through the hub 7 which has an internal thread on gaged with the thread of the plug, the parts being screwed together so that the head 14 of the plu is in contact with the front of the hub. it the rear end of the sleeve 4: is a bearing ring 15 (Fig. 3) which fits tightly in the sleeve. The shaft 16 extends through the pinion 3, sleeve 4, bearing ring 15, and plug 13 and is supported at its ends in bear ings held by or formed in the blocks 17 and 18 which are parts of the bracket 19 mount ed on and fastened to the top plate 20 of the machine. The pinion, sleeve 4: and ratchet may rotate while the shaft 16 is at rest, but the escafpement wheel together with the plug 13 is a .Xed to the shaft 16 by the set screws 21, so that when this wheel rotates it turns on the bearings of the shaft. The ratchet 5 and pawl 6 are similar in form, and pawl shown and bered 63 and '78 respectively, cation of Oscar WVoodward, 300,571, filed May 29, 1919.

The dog rocker which this machine contained, and in place of which novel dog rocking devices of difierent forms are shown herein, was mounted on the pivots 22 (Figs. 1 and 2), extending through the blocks 23 and made fast therein by the set screws 24:, these blocks being part of the support 25 carried by the top plate 20.

All of the above mentioned parts of the machine which are designated by the referdescribed, and num- 111 the appli- Serral N0.

Figs. 1 to 7, inclusive, and which arrangement and action to a ratchet ence numeral 1 et seq. to 25, inclusive, were invented or devised by others.

The eseapement which is illustrated in embodies many of the features of the invention herein claimed, includes both a snapping dog and a holding dog. It so operates as to allow the carriage to step only when the actuated key moves upward, but the holding dog may be so adjusted as to render it temporarily functionless, and when that is done, or when the holding'dog is detached from its sup port, the rest of the mechanism constitutes a reverse escapement which allows the carriage to step, or begin to step, before the depressed key moves upward. Whether the holding dog is adjusted as above indicated or not, the escapement comprises the com bination with the toothed-wheel or escapement wheel, which the carriage spring tends constantly to turn, of a dog carrier, a snapping dog, two stops and a key actuated dog rocking device. These elements are shown in their preferred forms in Figs. 1 to 7, inclusive.

' The dog carrier is mounted on a bearing dog carrler is the device which is shown in Fig. 5 and of which the ring 28 is a part,

The ring 28 surrounds the bearing 26 and is confined between the flange 27 and spider 10 of the escapement wheel, the ring being loosely mounted on the bearing. At one side of the ring 28 is an arm bent in four places, as appears by Fig. 5 and other figures. It is composed of the parts 29, 30, 31, 32 and 33, the part 31 having on it the projection 34 (Fig. 6), not fully shown in Fig. 5. The parts 32 and 33 form ears which are in alinement and perforated. The parts 30, 31 and the ears are farther from the axis of the ring 28 than the outer ends of the teeth of the escapement wheel are from the axis of the wheel, and when the dog carrier is mounted on its bearing the cars 32 and 33 extend across the space which is included between the planes of the faces of the spider 10, and the perforations in the ears are close to the plane of the front face of the spider (Figs. 2 and 3). The spring 35 connected to the projection 32 and to the top plate (Fig. 1) tends constantly to turn the dog CEtll'lQr from its normal position in the direction op posite to that in which the wheel steps.

The snapping dog 36 (Fig. 5) is attached to or formed on a supporting arm bent as shown and composed of the parts 37, 38, 39, 40 and 4.1 (Figs. 3-6) of which lO and 41 are perforated cars which fit between the ears 32 and 33 of the dog carrier. This arm on which it is angularly movable and which is pivotally attached to the dog carrier by the pin 42 which passes through the perforations in the ears of the dog carrier and arm and on which is the coiled spring 48 which acts against dog supporting arm is movable on its own pivotal axis, which is that of the pin 42, to change its position with relation to that of the dog carrier. When it is in one position the part 37, which overlaps the front face of the ring 28, is in contact with the ring. The spring 43 tends to keep the arm at rest on its own pivotal axis by pressing the arm against the ring, but the arm and dog carrier are movable together on their common axis, which is that of the wheel, whether the arm is in contact with the ring or not. The arm is movable from the ring, on the axis of the pin 42. by force that is great enough to overcome that of the spring 43.

The elongation 44 forming part of the elongated and curved dog shown (see Figs. 1, 4 and 5) has no function except when the carriage is driven or pushed toward the right while the carriage rack is engaged with the escapement pinion. If this feature of the invention should be omitted the feeding operation of the mechanism would not be affected. The length and depth of the elongation 44 are such as to cause it slightly to overlap and extend close to the back of the tooth next in front of the dog (36) when the dog is engaged with the wheel, and the inner surface 45 (Fig. 5) of the elongated dog should be curved, the axis of curvature being that of the wheel. The appendage 46, formed on or rigidly attached to the dog and extending farther from the axis of the wheel than do the teeth, has functions which depend on the coaction of the dog rocking device and stops with this appendage and which can best be clearly explained after said device and stops shall have been described.

The arrangement of the dog carrier, dog supporting arm and dog are such that the dog may extend into the path of the teeth of the wheel and may be moved out of that path by rocking the dog supporting arm on its own pivotal axis. That pivotal axis is in a plane to which the axis of the wheel is perpendicular, at a point on one side of said pivotal axis, and the teeth engaging face of the dog shown is at the same or approximately the same distance as is said point, from said pivotal axis. Preferably the teeth engaging face of the dog is part of the surface of a cylinder, the axis of which coincides with the pivotal axis of the dog, and to which the plane parallel to that axis and containing the axis of the wheel is tangent, the faces of the teeth of the wheel being also slightly curved to fit them to the face of the dog. It is evident therefore that the normal positions of the dog carrier and the parts 31 and 39. The

dog may be such as to enable the dog-to engage a tooth of the wheel either directly un der the axis of the wheel or on one side or the other of a vertical plane containing that axis. Their preferred normal positions,'especially when the invention is applied to a Remington machine, are those in which they are shown herein, and in which they are fitted to coact with an angularly movable dog rocking device which may replace the Remington dog rocker, and be mounted on its supporting pivots 22. When the dog is in the normal position indicated by each figure in which the dog is shown, it is engaged with a tooth of the wheel and the wheel prevents the spring 35 from turning the dog and dog carrier on the axis of the wheel.

The two stops above mentioned are arranged to limit angular movements of the dog carrier and dog 36 on their common axis, 2'. 6., the axis of the wheel. These stops and the dog rocking device are united when that device has the form shown in Figs. 1, 2, 5 and 7, but the stops may be attached to or united with some other part of the machine, as hereinafter explained. This particular dog rocking device comprises the shaft-like hub 47, upper and lower main arms 48 and 49, and rear arm 50, shorter than arm 48, the hub and these arms being a single forging or casting. The hub is mounted on the pivot pins 22 on which the device may rock as did the Remington dog rocker which it replaces, and the lower arm 49 is connected with the universal bar by means including the link 51, the rear part only of which is shown (Figs. 1 and 2). At the upper end of the arm 48 are stops 52 and 53, projecting upward from the enlargement 54, different views of the upper part of this arm, including the enlargement and stops, being shown in Figs. 1, 2, 5 and 7. The top faces of the stops are close to but a little below the pat-h of the teeth of the es capement wheel, and between these stops the appendage 46 of the dog36 extends, the body of the dog being OVer the stops. When the dog rocking device is in its normal position, in which it is shown, the stops extend past the appendage 46 toward the front of the machine, far enough to enable the dog 86 to rock out of engagement with the wheel without carrying the appendage from between the stops. The distance between the stops is great enough to leave a space between the appendage and the stop 53 when the appendage is in contact with the stop 52, but the space may be some narrower or much wider than the drawings show it, although the width must not be great enough to allow the dog to snap past more than one tooth of the wheel at a time. The angular plate composed of parts 55 and'56 is attached to the back of the enlargement 54 by screws 57 passing loosely through slots in the part 55, the plate being a slide, prevented by the heads of the screws from moving backward from its support 54 but movable in the direction of its own length on the stems of the screws. The spring 58 connected to it and to the pin 59 fixed in the arm 48 tends to keep the slide in that relation to its support in which it is shown. The part 56 of this slide passes loosely through an open slot in the stop 52 and nor mally extends from it toward the stop 53 and behind and close to the appendage 46, but between the stop 53 and the shoulder 60 formed by this part of the slide is a space 61 (Fig. 7) wide enough to allow the appendage 46 to pass into it. This slide forms part of the dog-rocking device.

The holding dog 62 is formed on or fastened to the arm 63 at its upper end and this arm is attached to the arm 50 of the dog rocking device by the screws 64 and 65. The screw 64 passes through the slot 66 cut in the arm 63 as indicated by the dotted outline shown in Fig. 2. If the screws 64 and 65 are loosened the arm 63 may be turned on the axis of the screw 65, so that the holding dog may be adjusted at any desired distance from the dog 36. When the holding dog is turned backward as far as it will go it will not be rocked intothe path of the teeth of the wheel as the dog rocking device is actuated by the universal bar. The spring 67 indicated by dotted lines in Fig. 2 and extending from a pin fixed in the framework to the arm 49 of the dog rocking device, is the restoring spring of that device.

The action of the escapement constructed as described and used when the holding dog is adjusted so as to enable it to coact with. the other parts resembles generally, and in some but not all respects particularly, that of a common escapement comprising a holding dog and a stepping dog. When the dog rocking device is in its normal position, shown in Fig. 2, the dog 36 is engaged by a tooth of the wheel and the appendage 46 is in contact with the stop 52, the wheel being held so as to prevent the carriage spring from turning it, by the joint action of the stop, appendage, andbody of the dog 36 on the engaged tooth. As the universal bar is actuated, on the depression of a printing key, backward motion is imparted to the link 51 and thence to the lower end of arm 49 of the dog rocking device, so that holding dog 62 and slide 55-56 together with stops 52 and 53 are carried forward, or toward the front of the machine. The slide, acting on appendage 46, pushes it forward as indicated by dotted lines in Fig. 7 and thus forces the dog 36 to turn on pin 42 and to pass out of the path of the engaged tooth as indicated by dotted lines in Fig. 4, but before the dog 36 clears that tooth the holding dog gets in its against the front side of path, and at the end of the downward movement of the key the wheel is held by the holding dog. Instantly after dog 36 clears the tooth, spring 35 turns the dog carrier and that dog on bearing 26 until appendage 46 meets stop 53, further motion of the dog carrier and "dog 36 on said bearing being prevented by the joint action of stop 53, the appendage, and the body and supporting arm of dog 36, on the dog carrier. As the appendage 46 passes from in front of part 56 of the slide, spring 43, acting through the dog supporting arm, presses dog 36 the tooth which the holding dog then engages, and there dog 36 stays as long as the holding dog continues to prevent the wheel from turning. When the printing key moves upward the dog rocking device impelled by its restoring spring returns to its normal position, carrying the holding dog backward and out of the path of the engaged tooth. As soon as the tooth is released the wheel turns and then dog 36, impelled by spring 43, snaps behind. the receding tooth, and the next advancing tooth meets dog 36 and pushes it back to its normal position where it is arrested and forced to stop the wheel, appendage 46 then being again in contact with stop 52.

If dog 62 is adjusted so that it will not be carried into the path of the teeth of the wheel, then the dog rocking device, on the depression of a printing key, disengages dog 36 from the wheel through the action of part 56 of the slide on appendage 46 as above explained, whereupon the wheel, released at the end of the downward movement of the key, begins to turn and simultaneously dog 36 snaps in the direction opposite to that in which the wheel turns. Should the key not beheld down at all the dog 36, having turned on the axis of the wheel until appendage 46 is in contact with stop 53, will enter the path of the approaching tooth as the wheel turns, and be forced back to its normal position by that tooth. The appendage46 will not touch the slide after it passes from it to stop 53, during the snapping action of the dog, provided the return movement of the rocking device is quick enough to withdraw the part 56 of the slide from the path of the appendage. If, however, the key should be held down, the appendage 46 enters the space 61 (Fig. 7 as the dog moves into the path of the advancing tooth, and unless the art 56 of the slide is withdrawn from the path of the appendage before the tooth acts on the dog, the appendage is forced against the shoulder 60 and pushes the slide along,

stretching the spring 67, until the shoulder is even with and the appendage in contact with the working face of the stop 52, when the dog and wheel arearrested as before explained. On the return of the dog rocking device to its normal position the slide, which from a tooth of the ratchet,

holding dog also is used, and would not be so much affected when the holding dog is not used as greatly to trouble highly skilled operators of machines which contain reverse escapements, since such operators seldom if ever hold keys down. If the space 61 were to be closed by part- 56 of the angular plate forming the described slide, of course the plate would not then act as a slide, and might be made fast to the part 56 of the dog rocking device. Then the whole function of the plate would be to push the dog out of engagement with the wheel as above explained.

Since dog 36 does not change its position with relation to the tooth which engages it as the wheel steps, of course then the faces of the dog and tooth are not subjected to 1 ear from being rubbed together.

rilthough the ratchet and pawl (5 and 6) bove described enable the scapement wheel 0 be kept at rest, when the carriage is re- ;acted to allow line af er line to be written, et unless special means is provided to overoine friction then tending to turn the wheel ackward, it will sometimes so turn enough '0 carry the engaged tooth away from the dog as the tooth advances in a letter spacing movement, there is lost motion to be absorbed before the tooth and dog can again coact in holding the carriage. This lost motion plus similar lost motion due to the retraction of the .pawl is liable to amount to enough to allow the carriage to travel more than a full letter space distance. Hence, although the carriage may be arrested at the proper position by the margin stops,

nevertheless it may thereafter advance a letter space distance the escapem nt, and when it does so advance and writing is immediately begun the first letter of a line is written at a letter space distance The function of the elongation 44 of dog 36 is to overcome th riction above referred to d thus prevent the movement of the en tooth of the wheel away from the dog Cinder the conditions explained. This elongation forms a stop with which the back of a tooth is brought in contact as it begins to move backward and which, although it will vield to force great enough to turn the dog on pin 42-, is nevertheless effective to prevent the result being that before it wiH be held by from its proper position.

the aforesaid friction from turning the wheel backward.

It is feasible to dispense with the ratchet and pawl, and were that to be done it would affect the utility of elongation 44' of dog 36. Let it be supposed that the ratchet 5 'is faston the hub 7 of the escapement wheelso that pinion 3, the ratchet, the escapement wheel and shaft 16 would all be forced'to rotate asa unit on the bearings of the shaft, as well when the carriage rack, engaging'tlie pinion,

moves to the right as when it moves to'the" Then if the carriage should be drawn left. by the line spacin lever or forced by the back spacing paw acting on the external faces of the teeth of ratchet 5, to travel toward the right, pin 42 by t e action of a tooth or teeth of the escapement wheel on the rear face of the dog, each tooth acting on the dog'as a:tooth of a backwardly turning ratchet wheel acts on a pawl, and turn to the required extent, and be reengaged by the dog at the end of the movement. only the functions but'also those of the ratchet and-pawl, and the lost motion which whole action would be that andthat' only which would result from its action either as the inner surface of the elongated dog fits the elongation both'to resist backwardmotion of the wheel and to coact with the teeth when the dog is turned by them on pin 42, as described.

The modification in Figs. 8 and 9 is the same in construction as the escape'ment illustrated in Figs; l7, inclusive, except in respect of the dogrocln ing device. and whatis mounted on it. The dog rocking device of this modificationincludes the shaft-like hub 47, lower arm 49 and rear designated by those numerals respectively, of the above described dog rocking device. The hub 47 of this modified device is to be mounted on the is to be connected to the link 51. The upper front arm 68, (Fig. 9) has at the top an en the plate is movablea little in the direction of its length on the screws asguides'. The plate, a top view of parts 83 and 74 of this which is shown in Fig. 10, extend over the head 69, the metal being bent as indicated, especially in F 1g. 9, and between them passes" These" the appendage 46 of the dog 36. parts of the plate correspond to and have the functions of the stops 52 and 53' formed on dog 36 would be turnedon the escapeinent wheel would The escapement would perform not peculiar to escapements' would result' from its which is partly shown arm 50, corresponding" to parts pivots 22, and it'sarm 49 plate is attached by the screws normally held of a tooth of the escapement the arm 4:8 of the dog rocking device heretofore described, the body of the plate being close to appendage a6 and the latter being against stop 73 by the action wheel on dog 36. The spring 75 which extends from this stop plate to the frame, or a rigid projection formed 011 or attached to it, such as the fixed pin 7 6, prevents the stop plate from being pushed toward the right side of'the machine by the action of appendage as on stop 73, except perhaps to a very slight extent at the instant when the appendage 1S driven against the stop by the wheel as it makes a stepping movement. The strength of the spring is such as to compel the stop late instantly to return to its normal position if it should be thus slightly forced from a it, and may be great enough to prevent the will be explained.

. rier and described, while the stops 7 3 and Tel perform' absorbed and partly stop plate from being moved perceptibly by force transmitted to it from the wheel.

The holding dog 62 of this modification has the supporting arm 77 which is attached .to rear arm 50 of the dog rocking device by 25 screws 64: and 65. The peculiar shape of arm 77 and the oblong opening 78 in the stop plate enable the carriage releasing slide shown in Figs. 10 and 11 to be used, as

In the operation of this modification the dog .36 is forced from the wheel by the action of the body of the stop plate on the appendage 4:6, and dog 62, dog 36, the dog carthe wheel act and coact as above the functions of stops 52 and 53. As the shock at the arrest of the carriage is taken by spring 75, and by it absorbed or partly transmitted to the the carriage is arrested with but lit- It will be seen that the force transmitted to the stop device by the wheel. does not so act on the dog rocking device of which the stop device is a part as to subject the pivot at the right end of hub r! of the dog rockingedevice to a sharp blow. The rightpivot of a common dog rocker is subjected to such a blow each time the carriage steps and that makes the escapement containing the dog rocker quite noisy.

The dog 36 may be forced out of engagement with the escapement wheel by means of a slide as well as by an angularly movable dog rocking device. This will be readily understood from the foregoing description and a brief explanation of what is shown in Figs. 10 and 11. The form of escapement illustrated in these figures is that represented in Figs. 8 and 9, but Figs. 10 and 11 also show a portion of a tabulator such as is used in Remington machines. In the tabulator frame 79, attached to the top plate 20 and other parts of the framework of the maframe, tle noise.

chine, the tabulator levers 80 are mounted on the fulcrum rod 81 fixed in the tabulator frame, the upper ends of the levers being movable toward the front of the machine when the tabulator keys are actuated. The dog rocking and carriage releasing slide 82 having backwardly extending arms 83 is attached by screws 84k to inner faces of the tabulator frame, the screws passing loosely through slots 85 in the arms 83. The edge 86 of the slide is close ttithe tabulator levers when the slide and levers are in their normal positions, and the springs 87 attached to the slide and frame 7 9 exert a backward pull on the slide. This slide passes on one side of and in front of the dog supporting arm 77 and into opening 78 in the stop plate 70. lVhen a tabulator key is actuated slide 82 is pushed by the tabulator lever through opening 78 and against appendage 46 of dog 36 and forces the dog forward until. the wheel is released. \Vhen the carriage is arrested by the tabulator stops and the tabulator lever returns to its normal position, dog 36 reengages the wheel as before explained and slide 82 is drawn back to its normal position by the springs 87. As will be seen, this slide does notinterfere withthe operation of the escapement, the length of slot 78 in stop plate 70 being greater than the width of the slide at its front end, and arm 77 being movable to carry dog 62 into the path of the teeth of the wheel although the slide extends in front of that arm.

. The particular escapement represented by Figs. 121 1, inclusive, comprises an angularly movable dog rocking device having the hub 47, lower arm 49 and upper arm 88 on which is the head 89. In the head is the recess 90 (Fig. 14:), open at the top and front of the head. Two walls of this. recess form the steps 91, 92 whichhave the functions of steps 52 and 53, and the back wall 93 of the recess extends behind and close to appendage 4.6 of dog 36, and acts on the appendage in the operation of the machine to force dog 36 out of engagement with the wheel, as does the body of stop plate 70. The holding dog 94: is affixed by screws 95 to the back of the head 89. This dog rocking device is to be mounted on the pivot pins 22 and to it link 51 is to be connected. The rest of this escapement is composed of parts that have been described. Its operation will be understood, it is believed, without further explanation.

In Figs. 15 and 16 are shown stops which are attached to the framework of the machine and which act to limit the angular movements of dog 36 and the dog carrier on the axis of the wheel. These stops 96 and 97 are parts of a bent plate which is fastened by screws 98 to the part 25 of the framework. 'Appendage 16 of dog 36 extends between these stops, and the front end of the finger 99, fastened to the arm 100 of the dog rocking device by screws 101, is

behind and close to the appendage, theholding dog 102 being on arm 100 at its upper end. This dog rocking device comprises also the hub 47 and lower arm a9, and when it is put into the machine it is mounted on the pivot pins 22 so that ported by them at its ends, and link- 51 is connected to the lower end of armed). The other parts of this escapement are the dog carrier, stepping dog and toothed wheel above described. As the-upper end of arm 100 moves forward, impelled by the action of link 51 on arm 49, finger 99 pushes ap pendage 46 before it until dog 36 clears the engaged tooth of the wheel. Then, the wheel being held by dog 102, the dog carrier and dog 36 turn on their common axis, appendage 46 is carried to and against stop 97, and thereafter dog 36 reenters the path of the teeth of the wheel and is restored to its normal position as the wheel steps when it is released from dog 102, retracted from it by the restoring spring of the dog rocking device. The joint action of stop 96, appendage 46 and body of dog 36, in stopping and holding the wheel at the end of a stepping movement, is the same as that of stop 52 and the appendage and body of the dog. It will be seen therefore that stops, which mechanism embodying the invention may include, might be attached to or formed on a fixed part of the machine, instead of the dog rocking device.

lVhat I claim as new and desire to secure by Letters Patent, is

1. In an escapement comprising a. toothed wheel and means tending constantly to turn it in one direction, the combination with the wheel of an angularly movable dog carrier, a dog, two stops, and a key actuated dog rocking device, the dog carrier being mounted on a bearing that is co-axial with the wheel and being subjected to'stress from a spring that tends constantly to turn it in the direction opposite to that in which the wheel steps, the dog being supported by the dog carrier and having a distinct pivotal axis and being subjected to stress from' a spring which tends to keep the dog at rest on its own pivotal axis, the stops being arranged to limit angular movements of the dog carrier and dog on said bearing,- and the dog rocking device being arranged to act on the dog so as to turn it on its own pivotal axis.

2. In an escapement comprising a toothed wheel and means tending constantly to turn it in one direction, the combination with the wheel of an angularlymovable dog carrier, a dog and arm and pair of ears all fast together, a pivot pin, two stops, and a key actuated dog rocking device, the dog carrier forming a ring and pair of ears and being mounted on a bearing that extends through said ring and is coaxial with the wheel and the hub is supbeing subjected to stress from a spring that tends constantly to turn it in the direction opposite to that in which the wheelsteps, the dog, being supported by said arm and first mentioned pair of ears and being pivotally secured to the dog carrier by said pivot pin, which extends through said two pairs of cars, and being subjected to stress from a spring which tends at rest on said pivot pin, the stops being arranged to limit angular movements of the dog carrier and dog on said bearing, and the dog rocking device being arranged to act on the dog so as toturn it on said pivot pin.

3. In an escapement comprising a toothed wheel and means tending constantly to turn it in one direction, the combination with the wheel of an angularly movable dog carrier, a dog and arm and pair of ears fast together, a pivot pin, a coiled spring, two stops, and a key actuated dog rocking device, the dog carrier forming a ring and pair of cars and being mounted on a bearing that extends through said ring and is coaxial with the wheel and being subjected to stress from a spring that tends constantly to turn it in the direction opposite to that in which the wheel steps, the dog being supported by said arm and first mentioned pair of ears and being pivotal-1y secured to the dog car rier by said pivot pin, which extends through said two pairs of cars and being subjected to stress from said coiled spring, which surrounds said pivot pin, the dog car rier and said arm being face to face and the arm being normally held by the spring against the dog carrier, the stops being arranged to limit angular movementsof the dog carrier and dog on said bearing, and the dog rocking device being arranged to act on the dog so as to turn it on said pivot pin.

4. In an escapement comprising a toothed wheel and means tending constantly to turn it in one direction, the combination with the wheel of an angularly movable dog carrier, a dog and arm fast together, two stops, and a key actuated dog rocking device, the dog carrier being at the front of the wheel and subjected to stress from a spring that tends constantly to turn it in the direction opposite to that in which the wheel steps and its bearing being coaxial with the wheel, said arm being pivotally connected to the dog carrier and the dog projecting rearwardl from said arm and being subjected to stress from a spring which tends to keep the dog at rest on its own pivotal axis, the stops being arranged to limit angular movements of the dog carrier and dog on said bearing, and the dog rocking device being arranged to act on the dog so .as to turn it on its own pivotal axis.

5. In an escapement comprising a toothed wheel and means tending constantly to turn to keep the dog said bearing, and the dog spring which tends it in one direction, the combination with the wheel of an angularly movable dog carrier, a dog and arm fast together, two stops, and a key actuated dog rocking device, the dog carrier being at the front of the wheel and subjected to stress from a spring that tends constantly to turn it in the direction opposite to that in which the wheel steps and its bearing being coaxial with the wheel, said arm being pivotally connected to the dog carrier and extending across part of the front face of the dog carrier and the dog projecting rearwardly from said arm and dog carrier and the arm and dog being subjected. to stress from a spring which tends to hold the arm against the dog carrier, the stops being arranged to limit angular movements of the dog carrier and dog on said bearing, and the dog rocking device being arranged to act on the dog so as to turn it on its own pivotal axis.

6. In an escapement comprising a toothed wheel and means tending constantly to turn it in one direction, the combination with the wheel of an angularly movable dog carrier, a dog and an elongation thereof fast together, two stops, and a key actuated dog rocking device, the dog carrier being mounted on a bearing that is coxial with the wheel and being subjected to stress from a spring that tends constantly to turn it in the direction opposite to that in which the wheel steps, the dog being supported by the dog carrier and having a distinct pivotal axis and being subjected to stress from a spring which tends to keep the dog at rest on its own pivotal axis, and the elongation of the dog extending nearly to and overlapping the back of the first tooth behind which the dog rests when it is fully engaged by the wheel, the stopslbeing arranged to limit angular movements of the dog carrier and dog on rocking device being arranged to act on the dog so as to turn it on its own pivotal axis.

7. In an escapement comprising a toothed wheel and means tending constantly to turn it in one direction, the combination with the wheel of an angularly movable dog carrier, a dog and an elongation thereof fast to gether, two stops, and a key actuated dog rocking device, the dog carrier being mounted on a bearing that is coaxial with the wheel and beingsubjected to stress from a spring that tends constantly to turn it in the direction opposite to that in which the wheel steps, the dog being supported by the dog carrier and having a distinct pivotal axis and being subjected to stress from a to keep the dog at rest on its own pivotal axis and the elongation of the dog extending nearly to and overlapping the back of the first tooth behind which the dog rests when it is fully engaged by the Wheel and having a cylindrical inner surface coaxial with the wheel, the stops being arranged to limit angular movements of the dog carrier and dog on said bearing, and the dog rocking device being arranged to act on the dog so as to turn it on its own pivotal axis.

8. Inan escapement comprising a toothed wheel and means tending constantly to turn it in one direction, the combination with the wheel of an angularly movable dog carrier, a dog, two stops, and a key actuated dog rocking device, the dog carrier'being mounted on a bearing that is coaxial with the wheel and being subjected to stress from a spring that tends constantly to turn it in the direction opposite to that in which the wheel steps the dog being supported by the dog carrier and having a distinct pivotal axis and being subjected to stress from a spring which tends to keep the dog at rest on its own pivotal axis, the bearing of the dog on this axis being farther from the axis of the wheel than are the outer ends ofthe teeth of the wheel and being bisected by a plane whichiis perpendicular tothe axis of the wheel and close to that part of the wheel from which the teeth spring, the stops being arranged to limit angular movements of the dog carrier and dog on said first mentioned bearing, and the dog rocking device being arranged to act on the dog so as to turn it on its own pivotal axis.

9. In an escapement comprising a toothed wheel and means tending constantly to turn it in one direction, the combination with the wheel of an angularly movable dog carrier, a dog and an appendage fast together, two stops, and a key actuated dog rocking device, the dog carrier being mounted on a bearing that is coaxial with the wheel and being subjected to stress from a spring that tends constantly to turn it in the direction opposite to that in which the wheel steps, the dog being supported by the dog carrier and having a distinct pivotal axis and being subjected to stress from a spring which tends to keep the pivotal axis, and the appendage of the dog extending farther than do the teeth, the stops being arranged to limit angular movements of the dog carrier and dog on said bearing, one of the stops being subject to contact with said appendage so as to enable thewheel to be arrested and held by the joint action of this stop and the appendage and bodyof the dog, and the dog rocking device being arranged to action the dog so as to turn it on its own pivotal axis.

10. In an escapement comprising a toothed wheel andmeans tending constantly to turn it in one dlrection, the combination withthe wheel of an angularly movable dog carrier,

a dog and an appendage fast togethen'two dog rocking destops, and a key actuated V166, the dog carrier being mounted on a from the axis of the wheel bearing that is coaxial with the wheel and being subjected to stress from a spring that tends constantly to turn it in the direction opposite to that in which the wheel steps, the dog being supported by the dog carrier and having a distinct pivotal axis and be ing su .ted to stress from a spring which tends to keep the dog at rest on its own pivotal axis and the appendage of the dog extending farther from the axis of the wheel than do the teeth, one of the stops being subject to contact with said appendage so as to enable the wheel to be arrested and held by the joint action of this stop and the appendage and body of the dog, the other stop being subject to contact with said appendage to enable the snapping movement of the dog to be limited by the joint action of this stop and the appendage, and the do rocking device being arranged to act on the dog so as to turn it on its own oivotal axis.

11. In an escapement comprising a toothed wheel and means tending constantly to turn it in one direction, the combination with the wheel or an angularly movable dog carrier, a dog, two stops, and a key actuated dog rocking device including a rocking arm, the dog carrier being mounted on a bearing that is co-axial with the wheel and being subjected to stress from a spring that tends constantly turn it'in the direction opposite to that in which the wheel steps, the dog being supported by the dog carrier and having a distinct pivotal axis and being subjected to stress from a spring which tends to keep the dog at rest on its own pivotal axis, the stopsbeing on said rocking arm and arranged to limitangular movements or the dog carrier and dog on said bearing, and the dog rocking device being arranged to act through said rocking arm on the dog so as to turn it on its own pivotal axis.

12. In an escapement comprising a. toothed wheel and means tending constantly to turn it in one direction, the combination with the wheel of an angularly movable dog carrier, a dog and an appendage ft'ast together, two stops, and a key actuated dogrocking device incluoing a rocking arm, the dog car rier being mounted on a bearing that is coaxial with the wheel and being-subjected to stress from a spring that tends constantly to turn it in the direction opposite to that in which the wheel steps, the dog being supported by the dog carrier and having a distinct pivotal axis and being subjected to stress from a spring which tends to keep the dog at rest on its own pivotal axis, and the appendage of the dog extending farther from the axis of the wheel than do the teeth, the stops being arranged to limit angular movements of the dog carrier and dog on said bearing, one of the stops being on said *oeking arm and subject to contact with said appendage so as to enable the wheel to be arrested and held by the joint action of the stop and the appendage and body of the dog, and the dog rocking device being arranged to act through said rocking arm on the dog so as to turn it'on its own pivotal axis.

13. In an escapement comprising a toothed wheel ant means tending constantly to turn it in one direction, the combination with the wheel of an angular-1y movable dog carrier, a dog and an appendage fast together, two stops, a shock absorbing spring, and a key actuated dog rocking device, the dog carrier being mounted on a bearing that is coaxial with the wheel and being subjected to stress from a spring that tends constantly to turn it in the direction opposite to that in which the wheel steps, the dog being supported by the dog carrier and having a distinct pivotal axis and being subjected to stress from a spring which tends to keep the dog at rest on its own pivotal axis, and the appendage of the dog extending farther from the axis of the wheel than do the teeth, the stops being arranged to limit angular movements of the dog carrier and dog on said bearing, one of said stops being subject to contact with said appendage so as to enable the'wheel to be arrested and held by the joint action of this stop and the appendage and body'ot the dog, and this stop being part of a stop device which is loosely mounted on its support and movable slightly from its normal position when it is driven by force acting in the direction of that ap plied to the stop by the wheel, the shock absorbin spring being connected to this stop device and to the frame of the machine and tending to keep the stop device in its normal position 'on its support, and the dog rocking device being arranged to act on the dog so as to turn it on its own pivotal axis.

14. In an escapement comprising a toothed wheel and means tending constantly to turi it in one direction, the combination with the wheel of an angularly movable dog carrier, a dog and an appendage fast together, a stop device, a shock absorbing spring, and a key actuated dog rocking device, the dog carrier being mounted on a bearing that is coaxial with the wheel and being subjected to stress from a spring that tends constantly to turn it in direction opposite to that in which the wheel steps, the dog being supported by the dog carrier and having a distinct pivotal axis and being subjected to stress from a spring'which tends to keep the dog at rest on its own pivotal axis and the appendage of the dog extending farther from the axis of the wheel than do the teeth, the stop device including a wheel arresting stop and a snaplimiting stop, and being loosely mounted on its support and movable slightly from its normal position when it is driven by force acting in the direction of that applied by the wheel to-the wheel arresting stop, each of as to turn it on its own pivotal axis.

15. In an escapement comprising a toothed I wheel and means tending constantly to turn it in one direction, the combination with the wheel of an angularly movable dog carrier, a dog and an appendage fast together, two stops, a shock absorbing spring, and a key artuated dog rocking device including an angularly movable arm, the dog carrier being mounted on a bearing that is coaxial with the wheel and being subjected to stress from a spring that tends constantly to turn it in the direction opposite to that in which the wheel steps, the dog being supported by the dog carrier and having a distinct pivotal axis and being subjected to stress from a spring which tends to keep the dog at rest on its own pivotal axis and the appendage of the dog extending farther from the axis of the wheel than do the teeth, the stops being arranged to limit angular movements of the dog carrier and dog on said bearing, one of said stops being subject to contact with said appendage so as to enable the wheel to be arrested and held by the joint action olf the stop and the appendage and body of the dog, and this stop being part of a stop device which is loosely mounted on the angularly movable arm of the dog rocking device and capable of sliding thereon when it is driven by force acting in the direction of that applied to the stop by the wheel, the shock absorbing spring being connected to this stop device and to the frame of the machine and tending to keep the stop device in its normal position on its support, and the dog rocking device being arranged to act on the dog so as to turn it on its own pivotal axis.

16. In an escapement comprising a toothed wheel and means tending constantly to turn it in one direction, the combination with the wheel of an angularly movable dog carrier, a dog and an appendage fast together, and a key actuateddevice forming a dog I'O('l ing device and stop device having two stops, the dog carrier being mounted on a bearing that is coaxial with the wheel and being subjected to stress from a spring that tends constantly to turn it in the direction oppo site to that in which the wheel steps, the dog being supported by the dog carrier and having a distinct pivotal axis and being subjected to stress from a spring which tends to keep the dog at rest on its own pivotal axis, and the appendage of the dog extending farther from the axis of the wheel than rocking device,

do the teeth, the key actuated device having three walls, which bound on three sides a space into which said appendage extends, two of these walls forming said stops and being subject to contact with said appendage so as to limit angular movements of the dog carrier and dog on said bearing, and the other wall beingmovable against said appendage so as to turn the dog on its own pivotal axis.

17. In an escapement comprising a toothed wheel and means tending constantly to turrr it in one direction, the combination with the wheel of an angularly movable dog carrier, a dog and an appendage fast together, two stops, and a key actuated dog rocking device, the dog carrier being mounted on a bearing that is coaxial with the wheel and being subjected to stress from a spring that tends constantly to turn it in the direction opposite to that in which the wheel steps, the dog being supported by the dog carrier and having a distinct pivotal axis and being subjected to stress from a spring which tends to keep the dog at rest on its own pivotal axis, and the appendage of the dog extending farther from the axis of the wheel than do the teeth, the stops being arranged to limit angular movements of the dog carrier and dog on said bearing, one of the stops being subject to contact with said appendage so as to enable the wheel to be arrested and held by the joint action of this stop and the appendage and body of the dog, and the dog rocking device including a slide subjected to stress from a spring which tends to hold the slide in'its normal position on said device, the slide being movable against said appendage so as to turn the dog on its own pivotal axis when the dog rocking device is actuated, and said slide having a shoulder behind which said appendage may pass when the dog is disengaged from the wheel, and on which said appendage may act so as to move the slide when the dog, driven by the wheel, carries said appendage to the wheel arresting stop.

18. In an escapement comprising a toothed wheel and means tending constantly to turn it in one direction, the combination with the wheel of an angularly movable dog carrier, a dog and an appendage fast together, two stops, and a key actuated dog the dog parrier being mounted on a bearing that is coaxial with the wheel and being subjected to stress from a spring that tends constant y to turn it in the direction opposite to that in which the wheel steps, the dog being supported by the dog carrier and having a distinct pivotal axis and being subjected to stress from a spring which tends to keep the dog at rest on its own pivotal axis, and the appendage of the dog extending farther from the axis of the wheel than do the teeth, the stops being arranged to limit angular movements of the dog carrier and dog on said bearing, one of the stops being subject to contact with said appendage so as to enable the wheel to be arrested and held by the joint action of this stop and the appendage and body of the dog, and the dog rocking device includingan angularly movable arm and a s 'de mounted on said arm and subjected to stress from a spring which tends to hold the slide in its normal position on said arm, the slide being movable against said appendage so as to turn the dog on its own pivotal axis when the dog rocking device is actuated, and said slide having a shoulder behind which said appendage may pass when the dog is disengaged from the wheel, and on which said appendage may act so as to move the slide when the dog, driven by the wheel, carries said appendage to the wheel arresting stop.

19. In an escapement comprising the mechanism specified in claim 1, the combination with such mechanism of a holding dog attached to th dog rocking device.

20. In an escapement comprising the mechanism specified in claim 9, the combination with such mechanism of a holding dog attached to the dog rocking device.

21. In an escapement comprising the mechanism specified in claim 10, the combination with such mechanism oi a holding dog attached to the dog rocking device.

22. In an escapement comprising the mechanism specified in claim 11, the combination with such mechanism of a holding dog attached to said rocking arm.

23. In an escapement comprising the mechanism specified in claim 12, the combination with such mechanism of a holding dog attached to said rocking arm.

24. In an escapement, the combination or" a toothed wheel subject to the action of means which tends constantly to turn it in one direction, an elongated stepping dog movable transversely of the path of the teeth oi the wheel, dog rocking device arranged to act on this dog to move it from said path, and means to limitthe movements of the dog in the direction in which it steps, the elongation of the dog forming a device which extends nearly to and ov rlaps the back of the first tooth behind which the dog rests when it is fully engaged by the wheel.

25. In an escapement, the combination of a toothed wheel subject to the action of means which tends constantly to turn it in one direction, an angularly movable dog carrier mounted on a bearing coaxial with the wheel, an elongated stepping dog attached to said carrier and movable transversely of the path of the teeth of the wheel, a dog rocking device arranged to act on this dog to foce it from said path, and means to limit the angular movements of the dog on said bearing, the. elongation of the dog extending nearly to and overlapping the back of the first tooth behind which the dog rests, when it'is fully engaged by the wheel and having a cylindrical surface which is coaxial wit-h the wheel and faces and lies close to an interdental portion of its periphery when the dog is in the path of the teeth.

26. In an escapement comprising the mechanism specified in claim 24, the combination with such mechanism, of a holding dog attached to the dog rocking device.

27. In an escapcment comprising the mechanism. specified in claim 25, the combination with such mechanism, of a holding dog attached to the dog rocking device.

28. In an escapement comprising a toothed wheel and means tending constantly to turn it in one direction, the combination with the wheel of, a dog carrier, a dog, two stops and a key actuated dog rocking device, the dog carrier being movable in one direction by a spring and in the opposite direction by force exerted on the 010 by the wheel, the dog being attached to the dog carrier and having a pivotal axis which is in a plane perpendicular to the axis of the wheel and being subjected to stress from a spring which tends to keep the dog at rest on its pivotal axis, the stops being ar-anged to limit the common movements of the dog carrier and dog, and the dog rocking device being arranged to act on the dog so as to turn it on its pivotal axis.

29. In an escapement comprsing a. toothed wheel and means tending constantly to turn it in one direction, the combination with the wheel, of a dog carrier, a dog and an appendage fast together, two stops, and a key actuated dog rocking device, the dog carrier being movable in one direction by a spring and in the opposite direction by force exerted on the dog by the wheel, the dog being attached to the dog carrier and having a pivotal axis which is in a plane perpendicular to the axis of the wheel and being subjected to stress from a spring which tends to keep the dog at rest on its pivotal axis, the stops being arranged to limit the common movements of the dog carrier and dog, and the dog rocking device being arranged to act on the appendage of the dog so as to turn the dog on its pivotal axis.

30. In an escapement mechanism, a toothed escape wheel, a dog carrier, a dog thereon movable transversely of the axis of said wheel and also longitudinally of said axis, and key actuated means for moving said dog independently of its carrier in the last mentioned direction, said dog carrier and said key actuated means being mounted independently of each other.

31. In an escapement mechanism, atoothed escape-wheel, a dog carrier, a dog thereon movable transversely of the axis of said Wheel and also longitudinally of said axis, and key actuated means for moving said dog independently of its carrier in the last mentioned direction, the dog carrier being mounted to turn angularly about the axis of the escape-Wheel, and the key actuated means being mounted in the framework.

32. In an escapement the combination of a toothed Wheel, a dog carrier, an actuating spring connected to the dog carrier, a spring pressed dog mounted on and movable relatively to the dog carrier, and key actuated dog moving means, the dog being normally engaged with the Wheel and the key actuated means being operative on the dog to disengage it from the Wheel While the dog carrier is at rest, and the dog carrier being movable to and fro at each operation of the cscapenient by said actuating spring and by force transmitted to the dog carrier from the Wheel respectively.

Signed at the borough of Manhattan, city of New York, in the county of New York and State of New York this 15th day of lilay, A. D. 1920.

DANIEL A. CARPENTER. li' itnesses LiLLIAN NELSON,

CHARLES E. SMITH. 

